docs: Addition of an example: Zoomable Circle Packing (#3841) #1
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Addition of an example: Zoomable Circle Packing
update to zoomable-circle-packing.md to correct (hopefully) the circle packing example reference link; update to zoomable-circle-packing.vg.json to remove superfluous references that were left over from a prior implementation
reworded the description in zoomable-circle-packing.md